Organic Radiation-Emitting Device, Use Thereof and a Method of Producing the Device

Abstract

The invention discloses an organic radiation-emitting device which includes a substrate, and at least one radiation-emitting organic layer, which is arranged on the substrate between a first and a second electrode layer. A first charge carrier transport layer, which includes a first charge carrier transport material and a first salt, is arranged between the first electrode layer and the radiation-emitting organic layer.

1 . An organic radiation-emitting device, comprising:
 a substrate layer;   a first electrode layer;   a second electrode layer;   at least one radiation-emitting organic layer arranged on the substrate between the first electrode layer and the second electrode layer; and   a first charge carrier transport layer arranged between the first electrode layer and the at least one radiation-emitting organic layer, the first charge carrier transport layer comprising a first charge carrier transport material and a first salt.   
   
   
       2 . The organic radiation-emitting device according to  claim 1 , wherein the first salt comprises an organic salt. 
   
   
       3 . The organic radiation-emitting device according to  claim 1 , wherein the first salt is redox stable. 
   
   
       4 . The organic radiation-emitting device according to  claim 1 , wherein the first salt is a constituent of a first ion conductor. 
   
   
       5 . The organic radiation-emitting device according to  claim 4 , wherein the first ion conductor is selected from the group consisting of polyelectrolytes and ionomers. 
   
   
       6 . The organic radiation-emitting device according to  claim 4 , wherein the first ion conductor comprises a polymer. 
   
   
       7 . The organic radiation-emitting device according to  claim 6 , wherein the polymer comprises a polyether compound. 
   
   
       8 . The organic radiation-emitting device according to  claim 6 , wherein the first ion conductor comprises a complex of the polymer with the first salt. 
   
   
       9 . The organic radiation-emitting device according to  claim 6 , wherein the polymer is redox stable. 
   
   
       10 . The organic radiation-emitting device according to  claim 6 , wherein the first ion conductor comprises poly(ethylene oxide) as the polymer and lithium trifluoroalkylsulfonate as the first salt. 
   
   
       11 . The organic radiation-emitting device according to  claim 1 ,
 wherein the first electrode layer comprises an anode, and   wherein anions exhibit greater mobility in the first charge carrier transport layer than cations.   
   
   
       12 . The organic radiation-emitting device according to  claim 11 , wherein the first charge carrier transport layer comprises a hole transport material as the first charge carrier transport material. 
   
   
       13 . The organic radiation-emitting device according to  claim 1 ,
 wherein the first electrode layer comprises a cathode, and   wherein cations have a greater mobility in the first charge carrier transport layer than anions.   
   
   
       14 . The organic radiation-emitting device according to  claim 13 , wherein the first charge carrier transport layer comprises an electrode transport material as the first charge carrier transport layer. 
   
   
       15 . The organic radiation-emitting device according to  claim 1 , wherein the radiation-emitting organic layer contains materials that are selected from the group consisting of electroluminescent low molecular weight (“small molecule”) compounds and electroluminescent polymers. 
   
   
       16 . The organic radiation-emitting device according to  claim 1 , further comprising a second charge carrier transport layer arranged between the second electrode layer and the at least one radiation-emitting organic layer, the second charge carrier transport layer comprising a second charge carrier transport material and a second salt. 
   
   
       17 . The organic radiation-emitting device according to  claim 16 , wherein the second charge carrier transport layer comprises a second ion conductor. 
   
   
       18 . The organic radiation-emitting device according to  claim 1 ,
 wherein the first electrode layer is arranged on the substrate, and   wherein the first electrode layer, the first charge carrier transport layer and the substrate are transparent to emitted radiation of the at least one radiation-emitting organic layer.   
   
   
       19 . The organic radiation-emitting device according to  claim 1 , further comprising:
 encapsulation arranged over the at least one radiation-emitting organic layer, the first electrode layer and the second electrode layer on the substrate,   wherein the electrode layers arranged in the vicinity of the encapsulation and the encapsulation are transparent to emitted radiation of the at least one radiation-emitting organic layer.   
   
   
       20 . The organic radiation-emitting device according to  claim 1 , wherein the first salt comprises a material such that, when an electrical field is applied, both anions and cations of the first salt are mobile in the first charge carrier transport layer. 
   
   
       21 . The organic radiation-emitting device according to  claim 1 , wherein a Schottky barrier is formed by migration of ions of the first salt. 
   
   
       22 . A method of using an organic radiation-emitting device for lighting applications, the method comprising:
 providing an organic radiation-emitting device that comprises a substrate, at least one radiation-emitting organic layer arranged on the substrate between a first electrode layer and a second electrode layer, and a first charge carrier transport layer arranged between the first electrode layer and the radiation-emitting organic layer, the first charge carrier transport layer comprising a first charge carrier transport material and a first salt; and   applying a voltage between the first electrode layer and the second electrode layer.   
   
   
       23 . A method of producing an organic radiation-emitting device, having the method comprising:
 providing a substrate;   forming a layer arrangement over the substrate, the layer arrangement comprising a radiation-emitting organic layer, a first electrode layer, a first charge carrier transport layer and a second electrode layer,   wherein the first charge carrier transport layer is formed between the first electrode layer and the radiation-emitting organic layer and comprises a first charge carrier transport material and a first salt.   
   
   
       24 . The method according to  claim 23 , wherein forming the layer arrangement comprises:
 forming the first electrode layer on the substrate;   forming the first charge carrier transport layer on the first electrode   forming the radiation-emitting organic layer on the first charge carrier transport layer; and   forming the second electrode layer on the radiation-emitting organic layer.   
   
   
       25 . The method according to  claim 24 ,
 wherein the first charge carrier transport layer comprises a first ion conductor,   wherein forming the first charge carrier transport layer comprises applying a mixture of the first charge carrier transport material and the first ion conductor to the first electrode layer.   
   
   
       26 . The method according to  claim 25 ,
 wherein polymers are used as the first charge carrier transport material and as a constituent of the first ion conductor, and   wherein forming the first charge carrier transport layer comprises applying a solution of a mixture of the first charge carrier transport material and polymers of the first ion conductor.   
   
   
       27 . The method according to  claim 25 ,
 wherein low molecular weight substances are used as the first charge carrier transport material and as a constituent of the first ion conductor, and   wherein forming the first charge carrier transport layer comprises applying from a gas phase the first charge carrier transport material and the low molecular weight substances of the first ion conductor.   
   
   
       28 . The method according to  claim 24 ,
 wherein a first ion conductor is used as the first charge carrier transport layer, the first ion conductor comprising an organic polymer and the first salt, and   wherein forming the first charge carrier transport layer comprises applying the organic polymer together with the first charge carrier transport material, a layer being formed and then a solution of the first salt being applied to the layer.   
   
   
       29 . The method according to  claim 23  wherein forming the layer arrangement comprises:
 forming the second electrode layer on the substrate;   producing forming the radiation-emitting organic layer on the second electrode layer;   forming the first charge carrier transport layer on the radiation-emitting organic layer; and   forming the first electrode layer on the first charge carrier transport layer.   
   
   
       30 . The method according to  claim 23 , further comprising forming, a second charge carrier transport layer between the second electrode layer and the radiation-emitting organic layer.